244
Figure 68 Multicast in multiple VPN instances
With multicast VPN, when a multicast source in VPN A sends a multicast stream to a multicast group,
of all possible receivers on the network for that group, only those that belong to VPN A, namely, in
Site 1, Site 3 or Site 5, can receive the multicast stream. The stream is multicast in these sites and in
the public network.
The prerequisites for implementing multicast VPN are as follows:
1.
Within each site, multicast for a single VPN is supported.
2.
In the public network, multicast for the public network is supported.
3.
The PE devices support multiple VPN instances as follows:
{
The PE devices connect with different sites through VPNs and support multicast for each
single VPN.
{
The PE devices connect with the public network and support multicast for the public
network.
{
The PE devices support information exchange and data conversion between the public
network and VPNs.
The device implements multicast VPN by means of the multicast domain (MD) method. This
multicast VPN implementation is referred to as MD-VPN.
The most significant advantage of MD-VPN is that it requires only the PE devices to support multiple
VPN instances. Therefore, it is not required to upgrade CE devices and P devices or change their
original PIM configurations. The MD-VPN solution is transparent to CE devices and P devices.
The term "router" in this document refers to both routers and Layer 3 switches.
For more information about MPLS L3VPN, see
MPLS Configuration Guide
.
For more information about BGP, see
Layer 3—IP Routing Configuration Guide
.
